Anti-polymerization purging device for styrene production through ethylbenzene dehydrogenation

Abstract

The utility model is applicable to the technical field of chemical production equipment, and in particular relates to an anti-polymerization purging device for styrene production by ethylbenzene dehydrogenation, which comprises a reactor base, a reactor is arranged on the surface of the reactor base, end sockets are arranged on two sides of the reactor, support bottom plates are connected to two sides of the reactor base, and the support bottom plates are connected with the reactor base. A sliding block is slidably connected to the surface of the supporting bottom plate, an annular gas conveying pipe is connected to the surface of the sliding block, a plurality of second connecting hoses are connected to the surface of the annular gas conveying pipe, and purging nozzles are arranged at the ends, away from the annular gas conveying pipe, of the second connecting hoses. According to the utility model, nitrogen is used as purging gas, so that the temperature of the sealing head area can be effectively reduced, and the styrene polymerization reaction is prevented. Compared with steam, the low-temperature characteristic of nitrogen can effectively avoid styrene polymerization, and the nitrogen is non-toxic, not prone to reaction and high in safety.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, specifically an anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation. Background Technology

[0002] In the industrial production of styrene from ethylbenzene dehydrogenation, temperature control in the reactor head region is a significant technical challenge. Since the ethylbenzene dehydrogenation reaction typically occurs at relatively high temperatures, styrene is prone to polymerization during this process, especially in areas such as the reactor head. Due to the shape of the head and the flow characteristics of the reactant gases, localized overheating or excessive gas concentrations can easily occur, leading to styrene polymer deposition. This not only affects production efficiency but can also cause reactor damage or even safety accidents. Therefore, existing technologies commonly employ steam purging of the head region, using heated steam to lower the temperature and prevent styrene polymerization.

[0003] However, traditional steam purging methods also have some drawbacks. First, the high temperature of the steam, while able to reduce the temperature of the end cap area to some extent, still poses a risk of styrene polymerization in certain areas due to heat accumulation. Second, the steam itself may react adversely with styrene or accelerate the polymerization reaction under high temperature conditions, thus increasing the likelihood of polymer deposition. Finally, steam purging often lacks sufficient uniformity, making it difficult to ensure adequate cooling and purging of the entire end cap surface. This can lead to uneven temperature control in some areas, affecting overall production stability and long-term equipment operation. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation, aiming to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A polymerization-preventing purging device for the production of styrene from ethylbenzene dehydrogenation includes a reactor base, on the surface of which a reactor is disposed. End caps are disposed on both sides of the reactor. A supporting base plate is connected to both sides of the reactor base. A sliding block is slidably connected to the surface of the supporting base plate, and an annular gas supply pipe is connected to the surface of the sliding block. A plurality of second connecting hoses are connected to the surface of the annular gas supply pipe, and a purging nozzle is disposed at the end of the second connecting hose away from the annular gas supply pipe.

[0007] The surfaces of the supporting base plate and the sliding block are jointly provided with a driving component, and the driving component is used to drive the sliding block to move on the surface of the supporting base plate.

[0008] A nitrogen storage tank is connected to the surface of the supporting base plate, and a nitrogen pump is installed on the surface of the nitrogen storage tank. An extraction pipe and a first connecting hose are respectively connected to both ends of the nitrogen pump.

[0009] Furthermore, the surface of the supporting base plate is provided with a guide groove, and the surface of the sliding block is equipped with a guide slider. The sliding block is slidably connected to the surface of the supporting base plate through the cooperation of the guide slider and the guide groove.

[0010] Furthermore, the drive assembly includes a bearing housing and a drive motor, both of which are mounted on the surface of the support base plate. The output end of the drive motor and the interior of the bearing housing are jointly equipped with a transmission screw. The side of the sliding block is provided with a transmission threaded hole, and the transmission screw is engaged with the interior of the transmission threaded hole.

[0011] Furthermore, the end of the extraction tube away from the nitrogen pump is located at the bottom of the nitrogen storage tank, and the end of the first connecting hose away from the nitrogen pump is connected to the inside of the annular gas delivery pipe.

[0012] Furthermore, the opening direction of the purging nozzle corresponds to the surface of the end cap.

[0013] Furthermore, the surface of the annular gas delivery pipe is equipped with several electrically operated telescopic rods, and one end of each of the electric telescopic rods is connected to a connecting rod, which is fixedly connected to the purging nozzle.

[0014] This utility model provides an anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation, which has the following beneficial effects:

[0015] First, using nitrogen as the purging gas effectively reduces the temperature in the end cap area, preventing styrene polymerization. Nitrogen's low-temperature properties are more effective than steam in preventing styrene polymerization, and nitrogen itself is non-toxic, non-reactive, and safe. Second, the sliding block design allows the purging nozzle to spray nitrogen evenly across the end cap surface, improving the purging effect and ensuring comprehensive and uniform purging. Furthermore, the nitrogen flow rate and pressure can be flexibly adjusted, allowing the device to adapt to different production conditions and requirements.

[0016] The application of this device can significantly reduce the risk of styrene polymerization in the head region during the ethylbenzene dehydrogenation reaction, improve the safety of the production process and the stability of the equipment, thereby effectively extending the service life of the reactor and reducing equipment maintenance and downtime. The implementation of this device not only improves production efficiency but also reduces the risk of accidents caused by styrene polymerization, demonstrating broad application prospects and good economic benefits. Attached Figure Description

[0017] Figure 1This is a schematic diagram of a polymerization-preventing purging device used in the production of styrene from ethylbenzene dehydrogenation.

[0018] Figure 2 This is a side view of the annular gas delivery pipe in an anti-polymerization purging device used in the production of styrene from ethylbenzene dehydrogenation.

[0019] In the diagram: 1. Reactor base; 2. Reactor; 3. Nitrogen pump; 4. Extraction pipe; 5. Annular gas delivery pipe; 6. First connecting hose; 7. Nitrogen storage tank; 8. Support base plate; 9. Bearing seat; 10. Sliding block; 11. Transmission screw; 12. Drive motor; 13. Electric telescopic rod; 14. Connecting rod; 15. Purge nozzle; 16. Second connecting hose; 17. End cap. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0022] like Figures 1-2 As shown in the figure, the present invention provides an anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation, comprising a reactor base 1, and a reactor 2 is disposed on the surface of the reactor base 1. End caps 17 are disposed on both sides of the reactor 2. A support base plate 8 is connected to both sides of the reactor base 1. A sliding block 10 is slidably connected to the surface of the support base plate 8. A guide groove is provided on the surface of the support base plate 8. A guide slider is installed on the surface of the sliding block 10, and the sliding block 10 is slidably connected to the surface of the support base plate 8 through the cooperation of the guide slider and the guide groove.

[0023] An annular gas supply pipe 5 is connected to the surface of the sliding block 10. Several second connecting hoses 16 are connected to the surface of the annular gas supply pipe 5, and a purge nozzle 15 is provided at the end of the second connecting hose 16 away from the annular gas supply pipe 5. The opening direction of the purge nozzle 15 corresponds to the surface of the end cap 17.

[0024] A drive assembly is provided on the surface of the support base plate 8 and the sliding block 10, and the drive assembly is used to drive the sliding block 10 to move on the surface of the support base plate 8.

[0025] A nitrogen storage tank 7 is connected to the surface of the supporting base plate 8, and a nitrogen pump 3 is installed on the surface of the nitrogen storage tank 7. An extraction pipe 4 and a first connecting hose 6 are respectively connected to both ends of the nitrogen pump 3. The end of the extraction pipe 4 away from the nitrogen pump 3 is located at the bottom of the inner side of the nitrogen storage tank 7, and the end of the first connecting hose 6 away from the nitrogen pump 3 is connected to the inside of the annular gas delivery pipe 5.

[0026] In one embodiment of this utility model, the reactor 2 is model E-314. The supporting base plate 8 can be detachably connected to the reactor base 1 by means of threaded bolts, and after the supporting base plate 8 is fixed on the reactor base 1, the axis of the annular gas supply pipe 5 and the axis of the end cap 17 are on the same horizontal straight line. The inner diameter of the annular gas supply pipe 5 is larger than the maximum diameter of the end cap 17, so that the annular gas supply pipe 5 can move smoothly around the periphery of the end cap 17.

[0027] The anti-polymerization purging device provided by this invention aims to reduce the risk of styrene polymerization by purging the reactor head area with nitrogen, thereby improving the safety and stability of the production process.

[0028] The device mainly includes a reactor base 1, a reactor 2, a head 17, a supporting base plate 8, a sliding block 10, an annular gas supply pipe 5, a purging nozzle 15, a nitrogen storage tank 7, and a nitrogen pump 3. Driven by the nitrogen pump 3, the device delivers nitrogen from the storage tank 7 through the gas supply pipe 5 to the purging nozzle 15. The movement of the sliding block 10 and the annular gas supply pipe 5 enables comprehensive purging of the surface of the head 17.

[0029] The specific working process is as follows: First, nitrogen gas in the nitrogen storage tank 7 is drawn in through the extraction pipe 4 of the nitrogen pump 3 and delivered to the annular gas delivery pipe 5 through the first connecting hose 6. The nitrogen gas flows out of the annular gas delivery pipe 5, enters the connected second connecting hose 16, and is then sprayed onto the surface of the reactor head 17 through the purge nozzle 15. In this way, the nitrogen gas can effectively reduce the temperature in the area of ​​the head 17, preventing the polymerization reaction of styrene.

[0030] To ensure uniformity of the purging effect, the device employs a sliding block 10 design. The sliding block 10, through a guide slider and a guide groove on the support base plate 8, can reciprocate left and right on the surface of the support base plate 8, driving the annular gas delivery pipe 5 and the purging nozzle 15 to reciprocate left and right. In this way, the purging nozzle 15 can cover the entire surface of the end cap 17, achieving comprehensive and uniform nitrogen purging.

[0031] Nitrogen pump 3 draws nitrogen from the bottom of nitrogen storage tank 7 through extraction pipe 4, ensuring efficient nitrogen supply. The nitrogen flow rate and pressure can be adjusted as needed to meet the purging requirements under different working conditions. The first connecting hose 6 and the second connecting hose 16 ensure smooth delivery of nitrogen from pump 3 to purging nozzle 15, ensuring the stability and efficiency of purging.

[0032] The beneficial effects of this device are mainly reflected in the following aspects: First, using nitrogen as the purging gas can effectively reduce the temperature in the end cap 17 area, preventing the polymerization reaction of styrene. Nitrogen's low-temperature characteristics are more effective than steam in preventing styrene polymerization, and nitrogen itself is non-toxic, non-reactive, and has high safety. Second, the design of the sliding block 10 allows the purging nozzle 15 to spray nitrogen evenly on the surface of the end cap 17, thereby improving the purging effect and ensuring comprehensive and uniform purging. Furthermore, the flow rate and pressure of nitrogen can be flexibly adjusted, allowing the device to adapt to different production conditions and needs.

[0033] The application of this device can significantly reduce the risk of styrene polymerization in the head region during the ethylbenzene dehydrogenation reaction, improve the safety of the production process and the stability of the equipment, thereby effectively extending the service life of the reactor and reducing equipment maintenance and downtime. The implementation of this device not only improves production efficiency but also reduces the risk of accidents caused by styrene polymerization, demonstrating broad application prospects and good economic benefits.

[0034] In this embodiment, the drive assembly includes a bearing housing 9 and a drive motor 12, and both the bearing housing 9 and the drive motor 12 are mounted on the surface of the support base plate 8. The output end of the drive motor 12 and the interior of the bearing housing 9 are jointly equipped with a transmission screw 11. The side of the sliding block 10 is provided with a transmission threaded hole, and the transmission screw 11 is engaged with the interior of the transmission threaded hole.

[0035] The drive assembly achieves the reciprocating motion of the purging device through the cooperation between the bearing housing 9, the drive motor 12, the transmission screw 11, and the sliding block 10. When the drive motor 12 starts, the output end of the motor is connected to the transmission screw 11 through the bearing housing 9, and the rotation of the drive motor 12 drives the transmission screw 11 to rotate. Since the transmission screw 11 meshes with the transmission thread hole of the sliding block 10, the rotation of the transmission screw 11 causes the sliding block 10 to reciprocate along the surface of the support base plate 8.

[0036] The reciprocating motion of the sliding block 10 drives the annular gas supply pipe 5 and its connected purging nozzle 15 to perform corresponding reciprocating motions, thereby achieving uniform purging of the surface of the end cap 17. The rotation direction of the transmission screw 11 determines the movement direction of the sliding block 10. Therefore, by controlling the start and stop of the drive motor 12, the movement trajectory of the purging nozzle 15 on the end cap 17 can be precisely controlled, ensuring that the surface of the end cap can be thoroughly and uniformly purged with nitrogen.

[0037] This working method enables the purging nozzle 15 to perform efficient and uniform nitrogen purging on the surface of the reactor head 17, thereby effectively reducing the temperature in the head area, preventing the styrene polymerization reaction, and ensuring the safety and stability of the production process.

[0038] In this embodiment, a plurality of electric telescopic rods 13 are installed on the surface of the annular gas supply pipe 5, and one end of the electric telescopic rod 13 is connected to a connecting rod 14, which is fixedly connected to the purging nozzle 15.

[0039] By extending and retracting the electric telescopic rod 13, the distance between the blowing nozzle 15 and the end cap 17 can be adjusted while the blowing nozzle 15 moves horizontally, ensuring uniformity and consistency during the blowing process.

[0040] Because the reactor head 17 has a conical structure, the curvature of the head surface changes, requiring the purging nozzle 15 to adjust its distance from the head surface according to different positions during horizontal movement. The extension and retraction of the electric telescopic rod 13 precisely controls the vertical position of the purging nozzle 15 relative to the head 17, ensuring that the contact distance between the purging nozzle 15 and the head 17 remains consistent during movement. This avoids excessively large or small distances between the nozzle and the head surface, ensuring that nitrogen gas can be evenly purged to every position on the head surface.

[0041] Specifically, the electric telescopic rod 13 automatically adjusts its vertical position according to the horizontal movement path of the purging nozzle 15. This not only maintains a constant distance between the nozzle and the end cap surface but also prevents uneven purging caused by the nozzle being too close or too far in certain areas, thereby improving the purging effect. The precise control of the electric telescopic rod 13 allows the device to automatically adapt to the conical structure of the end cap 17 during the purging process, achieving more efficient and stable purging.

[0042] This technical solution ensures uniform distribution of nitrogen throughout the entire head area, preventing the risk of localized overheating or styrene polymerization due to uneven purging. It effectively improves the safety and stability of the ethylbenzene dehydrogenation reaction process and extends the service life of the equipment.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polymerization-preventing purging device for the production of styrene from ethylbenzene dehydrogenation, comprising a reactor base (1), wherein a reactor (2) is disposed on the surface of the reactor base (1), and end caps (17) are disposed on both sides of the reactor (2), characterized in that, Both sides of the reactor base (1) are connected to a support base plate (8). A sliding block (10) is slidably connected to the surface of the support base plate (8), and an annular gas supply pipe (5) is connected to the surface of the sliding block (10). Several second connecting hoses (16) are connected to the surface of the annular gas supply pipe (5), and a purge nozzle (15) is provided at the end of the second connecting hose (16) away from the annular gas supply pipe (5). The surfaces of the supporting base plate (8) and the sliding block (10) are jointly provided with a driving component, and the driving component is used to drive the sliding block (10) to move on the surface of the supporting base plate (8); The surface of the supporting base plate (8) is connected to a nitrogen storage tank (7), and a nitrogen pump (3) is installed on the surface of the nitrogen storage tank (7). The two ends of the nitrogen pump (3) are respectively connected to an extraction pipe (4) and a first connecting hose (6).

2. The anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation according to claim 1, characterized in that, The surface of the supporting base plate (8) is provided with a guide groove, and the surface of the sliding block (10) is provided with a guide slider. The sliding block (10) is slidably connected to the surface of the supporting base plate (8) through the cooperation of the guide slider and the guide groove.

3. The anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation according to claim 2, characterized in that, The drive assembly includes a bearing housing (9) and a drive motor (12), and both the bearing housing (9) and the drive motor (12) are mounted on the surface of the support base plate (8). The output end of the drive motor (12) and the interior of the bearing housing (9) are jointly equipped with a transmission screw (11). The side of the sliding block (10) is provided with a transmission thread hole, and the transmission screw (11) is engaged with the interior of the transmission thread hole.

4. The anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation according to claim 1, characterized in that, The end of the extraction tube (4) away from the nitrogen pump (3) is located at the bottom of the nitrogen storage tank (7), and the end of the first connecting hose (6) away from the nitrogen pump (3) is connected to the inside of the annular gas delivery pipe (5).

5. The anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation according to claim 1, characterized in that, The opening direction of the purge nozzle (15) corresponds to the surface of the end cap (17).

6. The anti-polymerization purging device for the production of styrene from ethylbenzene dehydrogenation according to claim 1, characterized in that, The surface of the annular gas pipe (5) is equipped with several electric telescopic rods (13), and one end of the electric telescopic rod (13) is connected to a connecting rod (14), which is fixedly connected to the purging nozzle (15).

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